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Take a short piece of fuel line and an old pump oil can, fill the oil can with gas and clamp it to the line, pump the carb bowl full of gas, start the engine. Keep pumping and it will keep running, get to crazy and you will overfill the bowl and the gas will run out the top, fire hazard.
Take a portable air tank and a gas cap, drill a hole in the top of the gas cap (preferably one you know is fubar'ed) and install a gauge and air fitting in a line connected to the cap with a one way valve put 2 pounds of air pressure in the tank and you have a fuel pump as long as you keep the air pressure at 2 psi.
The IV idea posted above is a good one since you get pressure supplied by gravity as long as it is enough to get the valve in the float chamber to let the gas in.
Another suggestion, when you get it running take a timing light and point if down the carb and watch the fuel using the timing light for it's strobe effect, if you see any fuel dribbling out instead of being atomized, the carb is not working properly. Only exception is the power valve, which should not dribble but give you a forceful stream.
learned that in the late 1960s.
We used to use air pressure to pop out dents in fuel tanks, back when they were metal.
Last edited by Old Mechanic; 05-08-2019 at 06:40 AM.